関連する実験動画
Updated: May 4, 2026

07:51
Pull-down of Calmodulin-binding Proteins
Published on: January 23, 2012
24.2K
カルモジュリンによるローカルおよびグローバルCa2+センシングのメカニズムは,Ca2+チャネルとの複合体によるものです
Michael R Tadross1, Ivy E Dick, David T Yue
1Calcium Signals Laboratory, Departments of Biomedical Engineering and Neuroscience, The Johns Hopkins University School of Medicine, Ross Building, Room 713, 720 Rutland Avenue, Baltimore, MD 21205, USA.
Cell
|July 1, 2008
まとめ
カルモジュリンは,局所的なカルシウム感知のためにそのC-ロブを使用し,グローバルな感知のためにN-ロブを使用します. グローバルなカルシウム感知は,迅速なカルシウム放出とチャネル親和の違いから生じ,複雑な解読機構を明らかにします.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 細胞シグナル伝達 細胞信号伝達
背景:
- カルモジュリン (CaM) は,カルシウム (Ca2+) センサーとして作用し,しばしばCa2+ チャンネルと複合しています.
- CaMのC葉は局所的なCa2+の流れを感知し,N葉はグローバルなCa2+の変化を感知する.
- CaMによるグローバルなCa2+センシングのメカニズムは,ほとんど不明のままです.
研究 の 目的:
- CalmodulinによるグローバルなCa2+センシングの背後にあるメカニズムを解明する.
- グローバルなCa2+選択性に関する提案された理論を実験的に検証する.
- CaM/チャネル複合ダイナミクスを研究するための新しい方法論を開発する.
主な方法:
- Ca2+振動のミリ秒間制御を可能にする方法論を用いた.
- CaM/チャネル複合体におけるCa2+ダイナミクスを調査した.
- グローバルなCa2+選択性の理論的枠組みを開発した.
主要な成果:
- グローバルなCa2+の選択性は,CaMから急速なCa2+の放出から生じる.
- Ca2+チャネルは,Ca2+結合のCaMよりも,Ca2+フリーのCaMに対するより大きな親和性を表しています.
- CaM/チャネル相互作用から複雑な解読特性を実証した.
結論:
- この研究は,カルモジュリンによるグローバルなCa2+センシングのメカニズムを明らかにしています.
- この発見は,Ca2+の放出動力学と異なる結合親和性の重要性を強調しています.
- 開発された技術と洞察は,他のCa2+感知分子にも一般化できます.
関連する概念動画
Mechanically-gated Ion Channels
6.6K
Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
6.6K
Amplifying Signals via Second Messengers
6.1K
Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
6.1K
Feedback Regulation of Calcium Concentration
2.9K
Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
2.9K
Calmodulin-dependent Signaling
5.0K
Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
5.0K
Structure of Cadherins
4.0K
The cadherins were one of the first cell adhesion molecules discovered; the term “cadherins” is based on their calcium-dependent adhering properties. The first cadherins discovered on the epithelial, neuronal, and placental cells were named E-cadherin, P-cadherin, and N-cadherin, respectively. These classical cadherins share sequence and structural similarities. Other cadherins, including those involved in cell signaling, are grouped into non-classical cadherins. This...
4.0K
Tension Response at Adherens Junctions
3.2K
The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin...
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin...
3.2K

